Add-on headstock mass device for a stringed instrument



FIG. 1 is a top, side perspective view of an add-on headstock mass device for a stringed musical instrument showing my new design;

FIG. 2 is a bottom, side perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is another bottom plan view thereof;

FIG. 6 is a front elevational view thereof;

FIG. 7 is a side elevational view of both embodiments;

FIG. 8 is a top plan view thereof;

FIG. 9 is a top, side perspective view of a second embodiment thereof;

FIG. 10 is a bottom, side perspective view of FIG. 9;

FIG. 11 is a top plan view of FIG. 9;

FIG. 12 is a bottom plan view of FIG. 9;

FIG. 13 is another bottom plan view of FIG. 9;

FIG. 14 is a front elevational view of FIG. 9; and,

FIG. 15 is a top plan view of FIG. 9.

The two different guitars shown in broken lines in (FIGS. 3-4) and (FIGS. 11-12) represent environmental structure which forms no part of the claimed design. 

The ornamental design for an add-on headstock mass device for a stringed instrument, as shown and described. 